[182978] in North American Network Operators' Group
RE: Did *bufferbloat* cause the 2010 flashcrash?
daemon@ATHENA.MIT.EDU (Matthew Huff)
Thu Aug 6 13:58:43 2015
X-Original-To: nanog@nanog.org
From: Matthew Huff <mhuff@ox.com>
To: joel jaeggli <joelja@bogus.com>, Christopher Morrow
<morrowc.lists@gmail.com>, John Kristoff <jtk@cymru.com>
Date: Thu, 6 Aug 2015 17:55:38 +0000
In-Reply-To: <55C399E6.7060904@bogus.com>
Cc: nanog list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org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